| 摘要 |
A pneumatic tire (1) is provided in a bead portion (4) with a bead core (5) formed of a bead wire (20); the bead core (5) has a wound single bead wire structure formed from turns of the single bead wire (20), and has at least three wire layers (10); each side face of the bead core (5) has a shape such that it is possible to draw a common tangent (30) to at least two turns of the bead wire (20) appearing in the side face (51) which common tangent is substantially parallel with the tire radial direction; the turns of the bead wire (21) in the 1st wire layer (11) are alternated with the turns of the bead wire (22) in the 2nd wire layer (12) disposed on the outside of the 1st wire layer (11); the 1st wire layer (11) includes a turn (21) having the winding-start end (16) of the bead wire, which turn (21) is positioned between adjacent two turns (22) of the bead wire in the 2nd wire layer (12). |
